Drilling rigs are used for vibration free drilling of CFA piles, soil displacement piles or casing piles with or without grout injection. Depending on the type of drill casing several different pile systems can be made with a drilling rig. Drilling rigs are equipped with an hydraulic rotary head which is rotating the drill casing by torque and by a vertical pull-down force into the soil. Drilling rigs in general can be recognized by a reinforced leader which has to be suitable to bear the torque forces of the rotary head. Drilling rigs also are equipped with a more powerfull engine or a separate power pack to deliver the required oil flow to power the rotary head.